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Dwarf Fortress is single threaded, and likely to remain that way for the foreseeable future.

The simulation is single threaded. But a rendering thread that only needs to copy a kilobyte of data each frame? Trivial.

Also hopefully there's a pathfinding thread at some point.

It may be trivial to you, but it is abundantly clear by circumstantial evidence that ToadyOne is not a good programmer. This is beyond his means, otherwise it would have already been added.

There's no benefit to it. That's the much simpler reason it hasn't been done.

The things that would actually help to split out are also the things that would be difficult to split out.

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